EC/TDS/ Waterproof Combination Tester, Automatic Temperature Compensation (ATC), Range: 0-3999 Ms/cm / 0-2000 ppm / -5.0 To 60.0 ºC, Accuracy ± 2% F.S. -- 1413 Ms/cm Starter Calibration Package, Replacement Probe Model Is Mi59P. Waterproof Pocket Testers These instruments are designed for all applications. The IP67 Waterproof casing and double junction (for pH) replaceable electrode make them suitable also for heavy duty applications, such as Waste Water treatment and Agriculture. The modular design allows easy electrode and battery replacement. All Waterproof testers are supplied complete with calibration solution, batteries, instruction manual and screwdriver (if needed) for calibration.